BMI, or Body Mass Index, has been the standard quick health screening number for decades — calculated from just your height and weight, it gives doctors a fast first-pass sense of whether your weight falls in a healthy range. This calculator gives you your BMI instantly along with the standard category it falls into.
BMI Calculator
Calculate your Body Mass Index (BMI) and healthy weight range.
BMI Spectrum Visualizer
Standard CDC / WHO Weight Categories
| Category | BMI Range | Health Risk Standard |
|---|---|---|
| Underweight | Below 18.5 | Increased risk of nutrient deficiency / malnutrition |
| Normal / Healthy Weight | 18.5 – 24.9 | Lowest statistical risk for obesity-related conditions |
| Overweight | 25.0 – 29.9 | Moderate risk |
| Obesity Class I | 30.0 – 34.9 | Elevated cardiovascular & metabolic risk |
| Obesity Class II | 35.0 – 39.9 | High health risk |
| Obesity Class III (Severe) | 40.0 or greater | Very high / critical health risk |
BMI doesn’t account for muscle mass, so it works best as one data point among several rather than a complete health picture on its own. For the full explanation of what BMI does and doesn’t tell you, read our guide on how to calculate BMI, and pair it with our body fat percentage calculator for a more complete view.
Enter your height and weight above to get your BMI and see which category it falls into.